diff --git a/src/nostalgia/modules/core/include/nostalgia/core/gfx.hpp b/src/nostalgia/modules/core/include/nostalgia/core/gfx.hpp
index ca017384..0d3e34e5 100644
--- a/src/nostalgia/modules/core/include/nostalgia/core/gfx.hpp
+++ b/src/nostalgia/modules/core/include/nostalgia/core/gfx.hpp
@@ -103,6 +103,12 @@ oxModelEnd()
 
 void addEntry(TileSheetSet &set, ox::FileAddress path, int32_t begin = 0, int32_t size = -1) noexcept;
 
+[[nodiscard]]
+int tileColumns(Context&) noexcept;
+
+[[nodiscard]]
+int tileRows(Context&) noexcept;
+
 ox::Error loadBgPalette(
 		Context &ctx,
 		size_t palBank,
diff --git a/src/nostalgia/modules/core/src/gba/gfx.cpp b/src/nostalgia/modules/core/src/gba/gfx.cpp
index e2404fd2..21da2a81 100644
--- a/src/nostalgia/modules/core/src/gba/gfx.cpp
+++ b/src/nostalgia/modules/core/src/gba/gfx.cpp
@@ -22,8 +22,6 @@
 
 namespace nostalgia::core {
 
-constexpr auto GbaTileColumns = 32;
-constexpr auto GbaTileRows = 32;
 constexpr auto SpriteCount = 128;
 
 struct GbaTileMapTarget {
@@ -285,7 +283,7 @@ ox::Error loadSpriteTileSheet(
 }
 
 void setBgTile(Context&, uint_t bgIdx, int column, int row, BgTile const&tile) noexcept {
-	auto const tileIdx = static_cast<std::size_t>(row * GbaTileColumns + column);
+	auto const tileIdx = static_cast<std::size_t>(row * tileColumns() + column);
 	// see Tonc 9.3
 	MEM_BG_MAP[bgIdx][tileIdx] =
 			static_cast<uint16_t>(tile.tileIdx & 0b1'1111'1111) |
@@ -294,8 +292,8 @@ void setBgTile(Context&, uint_t bgIdx, int column, int row, BgTile const&tile) n
 			static_cast<uint16_t>(tile.palBank << 0xc);
 }
 
-void clearBg(Context&, uint_t bgIdx) noexcept {
-	memset(MEM_BG_MAP[bgIdx].data(), 0, GbaTileRows * GbaTileColumns);
+void clearBg(Context &ctx, uint_t bgIdx) noexcept {
+	memset(MEM_BG_MAP[bgIdx].data(), 0, static_cast<size_t>(tileRows(ctx) * tileColumns(ctx)));
 }
 
 uint8_t bgStatus(Context&) noexcept {
diff --git a/src/nostalgia/modules/core/src/gfx.cpp b/src/nostalgia/modules/core/src/gfx.cpp
index 2b85f805..3c941f8b 100644
--- a/src/nostalgia/modules/core/src/gfx.cpp
+++ b/src/nostalgia/modules/core/src/gfx.cpp
@@ -6,6 +6,17 @@
 
 namespace nostalgia::core {
 
+constexpr auto GbaTileColumns = 32;
+constexpr auto GbaTileRows = 32;
+
+int tileColumns(Context&) noexcept {
+	return GbaTileColumns;
+}
+
+int tileRows(Context&) noexcept {
+	return GbaTileRows;
+}
+
 // map ASCII values to the nostalgia charset
 constexpr ox::Array<char, 128> charMap = {
 	0,